linux-kernel - [PATCH] tracing: wake up tasks reading trace_pipe on write to trace

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Message-ID: <20100727224408.GB4142@joi.lan>
Date:	Wed, 28 Jul 2010 00:44:08 +0200
From:	Marcin Slusarz <marcin.slusarz@...il.com>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>
Subject: [PATCH] tracing: wake up tasks reading trace_pipe on write to
 trace_marker

Currently we rely on other code periodically waking up trace reader.
If there aren't any other data than markers, reader will never be woken up.
Fix it.

Signed-off-by: Marcin Slusarz <marcin.slusarz@...il.com>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Ingo Molnar <mingo@...hat.com>
---
 kernel/trace/trace.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 086d363..02e04c8 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -1520,6 +1520,7 @@ int trace_array_vprintk(struct trace_array *tr,
 	if (!filter_check_discard(call, entry, buffer, event)) {
 		ring_buffer_unlock_commit(buffer, event);
 		ftrace_trace_stack(buffer, irq_flags, 6, pc);
+		trace_wake_up();
 	}
 
  out_unlock:
-- 
1.7.1.1

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